CN106100312A - A kind of DC source start-up circuit being applicable to high input impedance - Google Patents
A kind of DC source start-up circuit being applicable to high input impedance Download PDFInfo
- Publication number
- CN106100312A CN106100312A CN201610717654.5A CN201610717654A CN106100312A CN 106100312 A CN106100312 A CN 106100312A CN 201610717654 A CN201610717654 A CN 201610717654A CN 106100312 A CN106100312 A CN 106100312A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/284—Modifications for introducing a time delay before switching in field effect transistor switches
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Direct Current Feeding And Distribution (AREA)
- Electronic Switches (AREA)
Abstract
The present invention provides a kind of DC source start-up circuit being applicable to high input impedance; the incoming end of Switching Power Supply input voltage VIN is connected to the input anode of amplifier U1 by under-voltage protecting circuit; the incoming end of switch power controller running voltage VCC is connected to the input negative terminal of amplifier U1; the outfan of amplifier U1 is connected between switch power source output voltage Vo, and switch power source output voltage Vo and under-voltage protecting circuit be additionally provided with time delayed turn-off circuit.To solve owing to oil field needs the well of test increasingly deeper, the power of needs is the most increasing, is difficult to reduce the starting current of downhole instrument Switching Power Supply, it is impossible to ensure that Switching Power Supply starts rapidly successful problem under high temperature, high-power, high input impedance.The invention belongs to logger field.
Description
Technical field
The present invention relates to a kind of start-up circuit, belong to logger field.
Background technology
In recent years, oil field needs the well of test increasingly deeper, and the power of needs is the most increasing, high temperature, high-power,
The starting current of downhole instrument Switching Power Supply how is reduced, it is ensured that Switching Power Supply can start rapidly and successfully become under high input impedance
More urgent.Original armored cable impedance is 20 Ω/km, and existing oil field wide variety of steel pipe type cable impedance reaches 90 Ω/km
Above, cable used by oilfield logging truck is generally at 3000m～6000m, and the underground equipment of logger should pass through single-core cable
It is powered, in addition it is also necessary to by this cable, downhole testing data are uploaded in real time.Switching Power Supply startup in the case of full load
Transient current is usually more than 5 times of rated current, has only to the rated current that downhole instrument consumes on armored cable
As a example by 0.2A, starting current is at more than 1A.In the case of there are 450 Ω source impedances in input, it is assumed that Switching Power Supply minimum
Running voltage is 100V, consumes 450V voltage drop on cable resistance, then ground installation needs the voltage provided to be at least 550V
This power work of guarantee is normal.After power initiation is normal, rated current drops to 0.2A, consumes voltage drop on cable resistance
For 90V, ground installation only need to provide 190V just can meet down-hole power and normally work, and the huge voltage difference before and after startup is the most several
Can not find suitable match circuit to adapt to.The producer of domestic production Switching Power Supply is a lot, does not the most adapt to high input impedance
Switching Power Supply producer, the input source impedance of regular tap power supply typically only allows for several ohm.
Summary of the invention
It is an object of the invention to: a kind of DC source start-up circuit being applicable to high input impedance is provided, to solve height
The problem of the startup in the case of heavy load of the Switching Power Supply under input impedance.
For solving the problems referred to above, intend the DC source start-up circuit using such a to be applicable to high input impedance, switch
The incoming end of power input voltage VIN is connected to the input anode of amplifier U1, switch power controller by under-voltage protecting circuit
The incoming end of running voltage VCC is connected to the input negative terminal of amplifier U1, and the outfan of amplifier U1 is connected to switch power source output voltage
It is additionally provided with time delayed turn-off circuit between Vo, and switch power source output voltage Vo and under-voltage protecting circuit.
In aforementioned start-up circuit, under-voltage protecting circuit is by resistance R1, R2, R4 and Zener diode V1, V3, V7 and metal-oxide-semiconductor
V4 forms, and resistance R1, Zener diode V1, V3 and V7 are sequentially connected in series at the incoming end of Switching Power Supply input voltage VIN and virtual earth
Between GND, Zener diode V1, V3 are all connected with virtual earth GND side with the positive pole of V7, and the D pole of metal-oxide-semiconductor V4 is connected to through resistance R2
The incoming end of Switching Power Supply input voltage VIN, the S pole of metal-oxide-semiconductor V4 through resistance R4 be connected to the G end of virtual earth GND, metal-oxide-semiconductor V4 with
The positive pole of Zener diode V3 is connected, and metal-oxide-semiconductor V4 is n-channel metal-oxide-semiconductor, and is also associated with steady between the D pole of metal-oxide-semiconductor V4 and S pole
Pressure diode, the positive pole of this Zener diode is extremely connected with the S of metal-oxide-semiconductor V4；Also include and be just series at Zener diode V3
Resistance R3 and R5 between pole and virtual earth GND, and the incoming end of Switching Power Supply input voltage VIN is by between resistance R3 and R5
Connecting portion is connected with the input anode of amplifier U1；
In aforementioned start-up circuit, the outfan of amplifier U1 is connected to the G pole of metal-oxide-semiconductor V6 through resistance R6, the S pole of metal-oxide-semiconductor V6
It is connected to switch power source output voltage Vo, diode V5 and Zener diode V2 phase successively through diode V5 and Zener diode V2
One end even is positive terminal, and one end that Zener diode V2 and diode V5 is connected is negative pole end, and the D pole of metal-oxide-semiconductor V6 and MOS
The S of pipe V4 is the most connected, and metal-oxide-semiconductor V6 is also to be also associated with voltage stabilizing two pole between n-channel metal-oxide-semiconductor, and the D pole of metal-oxide-semiconductor V6 and S pole
Pipe, the positive pole of this Zener diode is extremely connected with the S of metal-oxide-semiconductor V6；
In aforementioned start-up circuit, switch power controller running voltage VCC has two, and one of them Switching Power Supply controls
Device running voltage VCC is connected with the input negative terminal of amplifier U1 through resistance R7 and diode V8 in parallel, diode V8 and this switch
One end that power-supply controller of electric running voltage VCC is connected is negative pole end, and the negative pole end of diode V8 is also through resistance R8 and virtual earth GND
Being connected, the positive terminal of diode V8 is also connected with virtual earth GND through electric capacity C3, another switch power controller running voltage VCC
Incoming end be extremely connected with the S of metal-oxide-semiconductor V6, and the S pole of metal-oxide-semiconductor V6 is connected to virtual earth GND through electric capacity C1 and C2 in parallel.
Power supply be logger can the precondition of reliably working, Switching Power Supply start-up circuit is to ensure that Switching Power Supply is steady
Determine the basic demand of reliably working.This circuit is by arranging threshold voltage, time delay substep startup, and automatic transfer switch power supply controls
The modes such as the input voltage of device, solve low startup power supply, the Switching Power Supply difficulty in starting under Larger Dynamic range input voltage, work
Make the problems such as poor stability.
Succeeding in developing of this circuit, is suitable for high input impedance 50 Ω～450 Ω, wide input voltage 120V～350V, wide
30W under the conditions of operating temperature range-40 DEG C～+175 DEG C normally starts work with power source.This circuit successful Application
In designing to the down-hole power of Products, efficiently solve that the fluctuation of Switching Power Supply input terminal voltage is big, input impedance height causes
Power supply cannot normally start or frequent starting problem.
Compared with prior art, the present invention also has the following characteristics that
1. there is time delayed turn-off circuit, while ensureing that Switching Power Supply reliably starts, normally work in Switching Power Supply again
After switch power controller feeder ear and power bus are disconnected, it is to avoid bus voltage fluctuation is big to switch power controller
Impact has soft start defencive function, it is to avoid Switching Power Supply starts under abnormal voltage；
2. increasing Switching Power Supply and start the time, reduce starting current, cable bus voltage pulsation situation followed the tracks of by start-up circuit,
Automatic time delay, step-by-step movement promotes output voltage until output setting voltage, effectively reduces starting current；
3. there is under-voltage protecting circuit, make switch power controller normally can start in the range of setting voltage, effectively
Avoid switch power controller to bear the heating of big voltage difference to damage.Start-up circuit provides the control of Switching Power Supply by cable bus
Device running voltage；After normal work, start-up circuit disconnects bus voltage, Switching Power Supply self output voltage provide to controller
Voltage, utilizes V2 and V5 that switch power source output voltage feeds back to switch power controller feeder ear, it is achieved Switching Power Supply from
Power-supply service.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, by accompanying drawing, the present invention will be made into one below
Step ground describes in detail,
Embodiment:
Referring to the drawings 1, the present embodiment provides a kind of DC source start-up circuit being applicable to high input impedance, including: owe
Voltage protection circuit is made up of resistance R1, R2, R4 and Zener diode V1 (75V), V3 (33V), V7 (18V) and metal-oxide-semiconductor V4, resistance
R1, Zener diode V1, V3 and V7 are sequentially connected in series between the incoming end and virtual earth GND of Switching Power Supply input voltage VIN, voltage stabilizing
Diode V1, V3 are all connected with virtual earth GND side with the positive pole of V7, and the D pole of metal-oxide-semiconductor V4 is connected to Switching Power Supply input through resistance R2
The incoming end of voltage VIN, the S pole of metal-oxide-semiconductor V4 is connected to G end and the Zener diode V3 of virtual earth GND, metal-oxide-semiconductor V4 through resistance R4
Positive pole be connected, metal-oxide-semiconductor V4 is n-channel metal-oxide-semiconductor, and is also associated with Zener diode between the D pole of metal-oxide-semiconductor V4 and S pole, and this is steady
The positive pole of pressure diode is extremely connected with the S of metal-oxide-semiconductor V4；Also include be series at the positive pole of Zener diode V3 and virtual earth GND it
Between resistance R3 and R5, and the incoming end of Switching Power Supply input voltage VIN is by the connecting portion between resistance R3 and R5 and amplifier
The input anode of U1 is connected；
Time delayed turn-off circuit is made up of amplifier U1, metal-oxide-semiconductor V6 and peripheral circuit thereof, and the outfan of amplifier U1 is through resistance R6 even
Being connected to the G pole of metal-oxide-semiconductor V6, the S pole of metal-oxide-semiconductor V6 is connected to Switching Power Supply output electricity through diode V5 and Zener diode V2 successively
One end of being connected of pressure Vo, diode V5 and Zener diode V2 is positive terminal, Zener diode V2 and diode V5 be connected one
End is negative pole end, and the D pole of metal-oxide-semiconductor V6 is extremely connected with the S of metal-oxide-semiconductor V4, and metal-oxide-semiconductor V6 is also n-channel metal-oxide-semiconductor, and metal-oxide-semiconductor V6
Being also associated with Zener diode between D pole and S pole, the positive pole of this Zener diode is extremely connected with the S of metal-oxide-semiconductor V6；
Switch power controller running voltage VCC has two, one of them switch power controller running voltage VCC warp
Resistance R7 and diode V8 in parallel is connected with the input negative terminal of amplifier U1, diode V8 and this switch power controller work electricity
One end that pressure VCC is connected is negative pole end, and the negative pole end of diode V8 is also connected with virtual earth GND through resistance R8, diode V8's
Positive terminal is also connected with virtual earth GND through electric capacity C3, the incoming end of another switch power controller running voltage VCC and metal-oxide-semiconductor
The S of V6 is the most connected, and the S pole of metal-oxide-semiconductor V6 is connected to virtual earth GND through electric capacity C1 and C2 in parallel.
Under-voltage marginal value is determined by V1, V3, V7 voltage stabilizing value sum.Make the switch power controller can be at (120～350) V
Normally starting in voltage range, when VIN voltage is less than marginal value (the design is 120V), (i.e. V7 is steady for metal-oxide-semiconductor V4 grid voltage
Pressure value) it is low level, V4 turns off, and at VCC, voltage is zero, and controller does not works；When VIN starts more than 120V, V7 voltage stabilizing goes out
18V, metal-oxide-semiconductor V4 turn on；The VCC of amplifier U1 input negative terminal is still low level, and input anode is that 18V is through R3, R5 branch pressure voltage (this
Design is 12V), U1 output HIGH voltage, metal-oxide-semiconductor V6 turns on, and at VCC, voltage is 18V, and switch power controller starts；Pass through
After a period of time, Switching Power Supply stably exports 18V, and this supply voltage connects through diode V5 after stabilivolt V2 blood pressure lowering (4.7V) again
Receive VCC to realize switch power controller is powered；During Switching Power Supply starts to stablize this section, C3 is filled by VCC through R7
Electricity is to VCC, and owing to VCC turns off more than 12V, now amplifier U1 output low level, metal-oxide-semiconductor V6, VCC disconnects and being connected with VIN, this
After, controller is powered by switch power source output voltage completely.
Claims (4)
1. the DC source start-up circuit being applicable to high input impedance, it is characterised in that: Switching Power Supply input voltage VIN
Incoming end is connected to the input anode of amplifier U1, the access of switch power controller running voltage VCC by under-voltage protecting circuit
End is connected to the input negative terminal of amplifier U1, and the outfan of amplifier U1 is connected to switch power source output voltage Vo, and Switching Power Supply output
It is additionally provided with time delayed turn-off circuit between voltage Vo and under-voltage protecting circuit.
A kind of DC source start-up circuit being applicable to high input impedance, it is characterised in that: under-voltage
Protection circuit is made up of resistance R1, R2, R4 and Zener diode V1, V3, V7 and metal-oxide-semiconductor V4, resistance R1, Zener diode V1,
V3 and V7 is sequentially connected in series between the incoming end and virtual earth GND of Switching Power Supply input voltage VIN, Zener diode V1, V3 and V7
Positive pole be all connected with virtual earth GND side, the D pole of metal-oxide-semiconductor V4 is connected to the access of Switching Power Supply input voltage VIN through resistance R2
End, the S pole of metal-oxide-semiconductor V4 is connected through the positive pole of G end and Zener diode V3 that resistance R4 is connected to virtual earth GND, metal-oxide-semiconductor V4, MOS
Pipe V4 is n-channel metal-oxide-semiconductor, and is also associated with Zener diode between the D pole of metal-oxide-semiconductor V4 and S pole, the positive pole of this Zener diode
Extremely it is connected with the S of metal-oxide-semiconductor V4；
Also include resistance R3 and R5 being series between the positive pole of Zener diode V3 and virtual earth GND, and Switching Power Supply input
The incoming end of voltage VIN is connected with the input anode of amplifier U1 by the connecting portion between resistance R3 and R5.
A kind of DC source start-up circuit being applicable to high input impedance, it is characterised in that: amplifier
The outfan of U1 is connected to the G pole of metal-oxide-semiconductor V6 through resistance R6, and the S pole of metal-oxide-semiconductor V6 is successively through diode V5 and Zener diode V2
Being connected to one end that switch power source output voltage Vo, diode V5 and Zener diode V2 be connected is positive terminal, Zener diode
One end that V2 and diode V5 is connected is negative pole end, and the D pole of metal-oxide-semiconductor V6 is extremely connected with the S of metal-oxide-semiconductor V4, and metal-oxide-semiconductor V6 is also n
It is also associated with Zener diode, the positive pole of this Zener diode and metal-oxide-semiconductor between channel MOS tube, and the D pole of metal-oxide-semiconductor V6 and S pole
The S of V6 is the most connected.
A kind of DC source start-up circuit being applicable to high input impedance, it is characterised in that: switch
Power-supply controller of electric running voltage VCC has two, and one of them switch power controller running voltage VCC is through resistance R7 in parallel
Being connected with the input negative terminal of amplifier U1 with diode V8, diode V8 is connected with this switch power controller running voltage VCC
One end is negative pole end, and the negative pole end of diode V8 is also connected with virtual earth GND through resistance R8, and the positive terminal of diode V8 is through electricity
Hold C3 to be also connected with virtual earth GND, the S pole phase of the incoming end of another switch power controller running voltage VCC and metal-oxide-semiconductor V6
Connect, and the S pole of metal-oxide-semiconductor V6 is connected to virtual earth GND through electric capacity C1 and C2 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610717654.5A CN106100312B (en) | 2016-08-25 | 2016-08-25 | A kind of DC power supply start-up circuit suitable for high input impedance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610717654.5A CN106100312B (en) | 2016-08-25 | 2016-08-25 | A kind of DC power supply start-up circuit suitable for high input impedance |
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| Publication Number | Publication Date |
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| CN106100312A true CN106100312A (en) | 2016-11-09 |
| CN106100312B CN106100312B (en) | 2018-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610717654.5A Active CN106100312B (en) | 2016-08-25 | 2016-08-25 | A kind of DC power supply start-up circuit suitable for high input impedance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586559A (en) * | 2019-01-09 | 2019-04-05 | 深圳市爱宝莱照明技术有限公司 | A kind of start-up circuit and Switching Power Supply of off-line switching power supply |
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| CN206149133U (en) * | 2016-08-25 | 2017-05-03 | 贵州航天凯山石油仪器有限公司 | DC power supply starting circuit suitable for high input impedance |
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2016
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2077608A1 (en) * | 2008-01-02 | 2009-07-08 | Infineon Technologies Austria AG | Drive circuit for a switch in a switching converter |
| CN101931317A (en) * | 2009-06-24 | 2010-12-29 | 海洋王照明科技股份有限公司 | Power supply start control circuit and power supply |
| CN103138551A (en) * | 2011-11-30 | 2013-06-05 | 深圳市明微电子股份有限公司 | Control method and device for low current started and low voltage protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109586559A (en) * | 2019-01-09 | 2019-04-05 | 深圳市爱宝莱照明技术有限公司 | A kind of start-up circuit and Switching Power Supply of off-line switching power supply |
| CN109586559B (en) * | 2019-01-09 | 2023-10-20 | 深圳市爱宝莱照明技术有限公司 | Starting circuit of off-line switching power supply and switching power supply |
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| Publication number | Publication date |
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| CN106100312B (en) | 2018-08-28 |
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